A new study has found that greater cumulative exposure to estrogen in life can protect women from Alzheimer’s disease.
The findings come from an analysis of personal histories, MRI scans and cognitive tests on 99 women in their late 40s to late 50s. The researchers confirmed an earlier finding linking menopause to lower gray matter volume (GMV) in brain areas that are also vulnerable to Alzheimer’s. But they also linked indicators of higher overall estrogen exposure, such as a longer span of reproductive years (menarche to menopause), more children and the use of menopause hormone therapy and hormonal contraceptives, to higher GMV in some of these brain areas.
The study was an observational study rather than a clinical trial, but it added to the evidence that estrogen may have a protective effect on the female brain, limiting the loss of gray matter that normally comes with menopause, and thereby potentially reducing Alzheimer’s risk.
“Our findings suggest that while the menopause transition may bring vulnerability for the female brain, other reproductive history events indicating greater estrogen exposure bring resilience instead,” said study senior author Dr. Lisa Mosconi, an associate professor of neuroscience in neurology at Weill Cornell Medicine and director of the Women’s Brain Initiative, and associate director of the Alzheimer’s Prevention Clinic at Weill Cornell Medicine and NewYork-Presbyterian/Weill Cornell Medical Center.
Researchers estimated that nearly two thirds of those living with Alzheimer’s in the United States are women. The higher prevalence of Alzheimer’s in women may be due in part to women’s greater longevity, among other reasons. A leading hypothesis is that that vulnerability related to estrogen.
Receptors for estrogen molecules are found in cells throughout women’s brains, and the sex hormone has long been known not just to help steer brain development and behavior but also generally to have a nourishing and protecting role in the central nervous system. That protection doesn’t last forever, though. Estrogen levels decline steeply during the transition through menopause, and as recent research from Dr. Mosconi and others has shown, women tended to experience significant GMV loss during this transition.
The volume loss occured especially in brain regions that are the most heavily affected in Alzheimer’s, and at roughly the same time of life when the long, slow process of late-onset Alzheimer’s is believed to start. Thus, women’s mid-life loss of estrogen may be a key factor behind the higher risk of Alzheimer’s. The flip side of this hypothesis is that more estrogen, in particular a cumulatively greater estrogen exposure, could serve as a counter to the brain-weakening effect of menopause. That possibility is what Dr. Mosconi and her team sought to investigate in the new study.
The analysis covered 99 women aged 46-58 and a comparison group of 29 similarly aged men. It confirmed that the post-menopausal and peri-menopausal (starting menopause) women, compared with the pre-menopausal women and the men, had significantly lower GMV in brain areas such as the hippocampus, entorhinal cortex and temporal lobe regions.